Structural Characterization of Some Novel Oxidation Products of Triphenylstibine

Abstract

Room-temperature single-crystal X-ray structural characterizations of two oxidation products of triphenylstibine of the form XPh₃SbOSbPh₃X are recorded for X = Cl, NO₃. ClPh₃SbOSbPh₃Cl is monoclinic, P 2₁/c, Z = 4 f.u., a 9·109(4), b 19·809(8), c 19·30(2) Å, β 109·27(5)°, conventional R on F being 0·038 for N_o 4431 ‘observe’ (I > 3σ(I)) independent reflections. In this complex, Sb-O-Sb is quasi-linear, 173·1(3)°, in contrast to the previously recorded benzene solvate, in which it is 139·0(3)°; in the nitrate, [(O₂NO)Ph₃SbOSbPh₃(ONO₂)], triclinic, P^-1, Z = 2 f.u., a 15·609(5), b 13·238(4), c 10·140(2) Å, α 87·11(2), β 88·46(7), γ 72·93(2)°, R 0·036 for N_o 5275, it is also bent (137·0(2)°). The anionic substituent is opposed to the oxo bridge in the trigonal bipyramidal five-coordinate array about the metal in both complexes. A redetermination of the structure of Ph₈Sb₄O₆ is recorded, presenting a non-disordered model in a triclinic P^-1 cell, a 19·98(3), b 11·635(2), c 9·739(2) Å, α 92·28(1), β 98·98(1), γ 99·74(1)°, Z = 2 f.u., R 0·046 for N_o 3578. A new (‘β’) phase of triphenylstibine, crystallized from hexane/toluene is also recorded: monoclinic, P 2₁/c, a 15·386(8), b 11·304(5), c 19·078(8) Å, β11·64(4)°, Z = 8, R 0·045 for N_o 3393.